Staining for anaplastic large cell lymphoma. Anaplastic large cell lymphoma stained for H&E (hematoxylin and eosin; A), immunostains for βF1 (B), CD3 (C), and ZAP-70 (D) show negativity of the tumor cells with strong expression of the respective antigens in reactive small T cells. Immunofluorescent stains for (E) CD30 (green) and βF1 (red) (Zoom 2) or (F) CD30 (green), ZAP-70 (red), and CD3 (blue) confirm the negativity of CD30⁺ tumor cells for the respective antigens.